首先到SUN下载最新的JMF,然后安装。http://java.sun.com/products/java-media/jmf/index.jsp 然后,说一下需求 1. 用摄像头拍照 2. 在文本框输入文件名 3. 按下拍照按钮,获取摄像头内的图像 4. 在拍下的照片上有一红框截取固定大小的照片。 5. 保存为本地图像为jpg格式,不得压缩画质 技术关键,相信也是大家最感兴趣的部分也就是如何让一个摄像头工作,并拍下一张照片了。 利用JMF,代码很简单: //利用这三个类分别获取摄像头驱动,和获取摄像头内的图像流,获取到的图像流是一个Swing的Component组件类 public static Player player = null; private CaptureDeviceInfo di = null; private MediaLocator ml = null; //文档中提供的驱动写法,为何这么写我也不知:) String str1 = "vfw:Logitech USB Video Camera:0"; String str2 = "vfw:Microsoft WDM Image Capture (Win32):0"; di = CaptureDeviceManager.getDevice(str2); ml = di.getLocator(); try { player = Manager.createRealizedPlayer(ml); player.start(); Component comp; if ((comp = player.getVisualComponent()) != null) { add(comp, BorderLayout.NORTH); } } catch (Exception e) { e.printStackTrace(); } 接下来就是点击拍照,获取摄像头内的当前图像。 代码也是很简单: private JButton capture; private Buffer buf = null; private BufferToImage btoi = null; private ImagePanel imgpanel = null; private Image img = null; private ImagePanel imgpanel = null; JComponent c = (JComponent) e.getSource(); if (c == capture)//如果按下的是拍照按钮 { FrameGrabbingControl fgc =(FrameGrabbingControl) player.getControl("javax.media.control.FrameGrabbingControl"); buf = fgc.grabFrame(); // 获取当前祯并存入Buffer类 btoi = new BufferToImage((VideoFormat) buf.getFormat()); img = btoi.createImage(buf); // show the image imgpanel.setImage(img); } 保存图像的就不多说了,以下为示例代码 BufferedImage bi = (BufferedImage) createImage(imgWidth, imgHeight); Graphics2D g2 = bi.createGraphics(); g2.drawImage(img, null, null); FileOutputStream out = null; try { out = new FileOutputStream(s); } catch (java.io.FileNotFoundException io) { System.out.println("File Not Found"); } JPEGImageEncoder encoder = JPEGCodec.createJPEGEncoder(out); JPEGEncodeParam param = encoder.getDefaultJPEGEncodeParam(bi); param.setQuality(1f, false);//不压缩图像 encoder.setJPEGEncodeParam(param); try { encoder.encode(bi); out.close(); } catch (java.io.IOException io) { System.out.println("IOException"); } |
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